#include <stdio.h>
// #include <stdbool.h>

int main()
{
   int year, leap;
   scanf("%d", &year);
   if (year % 4 == 0)
   {
      if (year % 100 == 0)
      {
         if (year % 400 == 0)
            leap = 1;
         else
            leap = 0;
      }
      else
         leap = 1;
   }
   else
      leap = 0;
   if (leap)
      printf("%d is ", year);
   else
      printf("%d is not ", year);
   printf("a leap year.\n");
   return 0;
}
